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Flashcards in Test 1 Deck (79):
1

Precision

All in one area

2

Accuracy

Close to bullseye

3

Theory

Something you can’t prove

4

Law

Happens all the time in nature

5

# of sig figs 008.0030

5

6

# of sig figs in 0.00800

3

7

# of sig figs in 5000? What about 5000.?

0, 4

8

Matter

All physical material in the universe

9

Atoms are usually found in a ______ State

Combined

10

Molecules can be

Two of the same atoms or two different atoms

11

Elements are the

Building blocks of matter

12

A pure substance

Cannot be separated into simpler substances by physical means

Has definite and constant chemical+physical properties

13

Example of definite chemical+physical properties

Melting/boiling points

14

A pure ELEMENT is

A pure substance that consists of only one type of ATOM

15

Pure COMPOUND is

A pure substance that has MORE THAN ONE TYPE of atom

16

Allotropes are?

Elements which have a different number of atoms in the molecule. They have different chemical and physical properties

17

Individual elements and compounds are all _____

Pure

18

Is NaCl pure?

Yes

19

Is NaCl+H2O pure?

No it has two compounds

20

6 main elements in the human body?

CHNOPS

21

When a substance goes through a ______ change, its physical appearance changes, but its chemical nature does not

Physical

22

When a substance changes it’s composition, it undergoes a ____ change

Chemical

23

Kelvin Scale

Same increment as Celsius
Absolute zero is -273.15°C

24

Celsius

Water freezes at 0°
Boils at 100°

25

Fahrenheit

Water freezes at 32°
Boils at 212°

26

Density formula
❤️

M

V

27

Density is measured in

g/cm^3

28

Density of 1g of pure water has a volume of _____

1cm^3

29

If matter is NOT uniform throughout then it is _____

Heterogeneous

30

If matter IS uniform throughout then it is ______

Homogeneous

31

If a pure substance CAN be decomposed chemically into something simpler, then the substance is a _______

Compound

32

A mixture ________ a chemical combining of substances

Is not

33

In a compound the ______ are _______ combined so that the elements that make up the compound ______ their identities and ______ take on a new set of properties

Atoms
Chemically
Lose
Do

34

The smallest identifiable unit of a compound is a(n) ______ which is made up of ________s which are chemically bonded

Element
Atoms

35

T/F A mixture is always made up of a combination of elements

False

36

In a mixture of the substances ________ their identities

Retain

37

In a mixture of the substances involved ______ be separated by a simple physical process

Can

38

And a compound the elements involved _______ be separated by a simple physical process because the elements are ______ bonded

Cannot
Chemically

39

T/F An element can be broken down into a simpler substance

False

40

The smallest identifiable unit of an element is a(n) ________

Element

41

Hydrogen

H

42

Helium

He

43

Lithium

Li

44

Beryllium

Be

45

Boron

B

46

Carbon

C

47

Nitrogen

N

48

Oxygen

O

49

Fluorine

F

50

Neon

Ne

51

****Sodium

Na

52

Magnesium

Mg

53

Aluminum

Al

54

Silicon

Si

55

Phosphorus

P

56

Sulfur

S

57

Chlorine

Cl

58

Argon

Ar

59

****Potassium

K

60

Calcium

Ca

61

Titanium

Ti

62

Chromium

Cr

63

Manganese

Mn

64

****Iron

Fe

65

Cobalt

Co

66

Nickel

Ni

67

*copper

Cu

68

Zinc

Zn

69

Arsenic

As

70

Bromine

Br

71

****silver

Ag

72

Iodine

I

73

****Gold

Au

74

****mercury

Hg

75

****Lead

Pb

76

****Krypton

Sn

77

****Tin

Sn

78

****Tungsten

W

79

Radon

Rn